For studying of insolation of architectural objects with mirror walls, reflected solar radiation shall be accounted for. Most ways of insolation duration estimation are based on geometry of visible solar path, namely the geometrical model of the process of insolation of a point of Earth surface. This model is the daily cone of sunrays. At the same time, there is a daily cone of reflected sunrays in a point of a reflective surface. Using this model, insolation of a mirror reception hall in a unique building in the Russian South was studied. Geometric modelling has shown that on the floor of the hall of mirrors in some areas there is an addition of three reflected from the faces and the corresponding direct beams of solar radiation. The shots made by means of the thermal camera testo 882 have confirmed reliability of the proposed geometrical model. 1. Spiridonov, A.V. Glass Revolution in Architecture [Steklyannaya revolyutsiya v arkhitekture] // Okna. Dveri. Fasady, Vol. 44, Autumn 2011, pp. 22–26.
2. Spiridonov, A.V., Shubin, I.L. Safe Glazing for Glass Buildings [Bezopasnoye ostekleniye dlya steklyannykh zdaniy] // Arkhitektura i stroitelstvo Omskoy oblasti. Vol. 158/2021, pp. 44–48.
3. Spiridonov, A,V., Umniakova, N.P. Inspection of the State (General and Instrumental) of Historical Translucent Structures of the Pushkin State Museum of Fine Art. // Light&Egineering, Volume 27, Number 3, 2019, pp. 26–31.
4. Spiridonov, Alexander V., Umniakova, Nina P. and Valkin, Boris L. Recommendations for the Restauration of Historical Translucent Coating Pushkin Museum. // Light & Engineering, Vol. 28, Number 5, 2020, pp. 76–83.
5. Insolation and Shading [Insolyatsiya i solntsezachshita] / Light Engineering Handbook [Spravochnaya kniga po svetotekhnike]. 4th edition. Moscow, 2019. pp. 553–566.
6. Podgorniy, A.L., Shchepetova, I.M., Sergeychuk, O.V., Zaytsev O.M., Protsyuk, V.P. Translucent Building Structures [Svitoprozori ogorodzennya budinkiv] / Kyiv: Vitrina, 2005, 281 p.
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9. Podgorniy, A.L. On Automation of Insolation Calculations [K voprosu avtomatizatsii insolyatsionnykh raschyotov] / Prikladnaya geometriya i inzhenernaya grafika / Kiev, KISI, 1979, Ed. 31, pp. 12–15.
10. Dvoretsky, Alexander T., Spiridonov, Alexander V., Shubin, Igor L., and Klevets, Ksenia N. Accounting of Climatic Features in Designing Solar Shading Devices. // Light & Engineering, vol. 26, # 2, 2018, pp. 162–166.
11. Dvoretsky, A.T., Morgunova, M.A., Sergeichuk, O.V., Spiridonov, A.V. Methods of Designing Immovable Sun Protection Devices. Light & Engineering, 2017, Vol. 25, # 1, pp. 115–120.
12. SP 370.1325880.2017 Solar Shading Devices in Buildings. Design rules [Ustroystva solntsezashchitnyye zdaniy. Pravila proyektirovaniya].

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• insolation of premises
• daily reflected sun rays cone model
• envelopes of shadows and reflections
• direct solar radiation
• temperature distribution graph